what are the best free logo design app?

People have started to contemplate on applications for everything and I have come to know that now even logo designing is possible through an app. Is this a good idea to make a logo by various best free logo design apps ? Being in need of quality logos constantly I want to get to something that could be seen as the permanent solution of making the logos. Is the application a permanent solution and would it be able to give me the quality logos for different themes?